Cory Monteith's Mom Opens Up Year After Son's Death: 'The Loss is Horrendous'

In an exclusive interview with ABC News more than a year after the "Glee" star died of a drug overdose, Ann McGregor reveals she's only now coming to terms with her son being gone.

Cory Monteith's mom is just now beginning to accept the death of her son, more than a year after he died of a drug overdose, she said in an exclusive interview that aired on Thursday's Good Morning America.

"The loss is horrendous," Ann McGregor said. "Until three days ago, I couldn't look at a picture of Cory, so there's been progress."

She was also hesitant to give advice to mothers of stars in similar predicaments to the one her son was in, saying she doesn't think parents can change their children's choices. All she could offer was a plea to honor the present.

"Live every moment. Grab the second," she said.

McGregor also talked about her son's childhood and when she started seeing signs of trouble, even sharing exclusive photos and videos with ABC News (included in the below clip).

"Cory always had that mischievous side of him, always looking for stimulation," his mother said, adding that her son had a code blue at age 15, calling that "the turning point."

"I remember after Cory's first OD, the drive we took, and all I did was stare into his eyes and hug him and look at him cause I had this feeling, I really want to know him, 'cause I'm not going to have him my entire life," she said.